TW201318829A - Air compressor - Google Patents

Abstract

An air compressor includes a compression unit, a drive unit, a tank unit, and a control circuit unit. The compression unit is configured to generate a compressed air and provided with a handle positioned above a center of gravity of the air compressor. The drive unit is configured to drive the compression unit. The tank unit is disposed below the compression unit and includes a plurality of air tanks configured to reserve the compressed air. The compressed air reserved in the tank unit has a pressure value. The control circuit unit is configured to detect the pressure value of the compressed air reserved in the tank unit and to control the drive unit to drive the compression unit.

Description

Air compressor

The present invention relates to an air compressor for supplying compressed air to a power tool, wherein the power source of the power tool is compressed air.

The multi-stage air compressor disclosed in Japanese Unexamined Patent Publication No. Publication No. 2010-059917 includes a drive unit, a low pressure side compression unit, a high pressure side compression unit, an air tank, and a joint. The low pressure side compression unit and the high pressure side compression unit are connected to each other. Each of the low pressure side compression unit and the high pressure side compression unit is adapted to be driven by the drive unit (such as a motor) and to generate compressed air. The air tank is adapted to hold compressed air generated by the high pressure side compression unit. The joint has a pressure relief valve for relieving compressed air held in the air tank so that the compressed air can be withdrawn from the air tank. In this type of air compressor, a socket is connected to the joint to discharge the compressed air to a pneumatically operated fastener driving tool.

Such an air compressor acts as a power source for a pneumatic tool primarily used in construction projects. Generally, two types of air compressors are available. An air compressor is used at a work site that consumes a relatively large amount of air. This type of air compressor includes two or more air slots and two or more handles, and the user needs to carry the air compressor with both hands. Another air compressor is typically used for a pneumatic tool for internal work. This type of air compressor includes a single air tank and is small and lightweight. The user can carry the air compressor with one hand.

Typically, a portable air compressor is used in an internal work location in a high rise building. When working in a high-rise building, the user needs to climb the stairs while carrying the air compressor. In view of portability, the air compressor has a small and lightweight configuration. In order to make the air compressor compact and lightweight, the size of the compression unit, the drive unit, and the air groove are reduced. Therefore, the portable air compressor can only store a small amount of compressed air in the air tank and only a small amount of compressed air from the air tank. For this reason, the amount of compressed air that the pneumatic tool can consume is limited in actual operation. The continuous operation of the pneumatic tool causes the pressure of the compressed air in the air tank to drop, which requires re-action of the drive unit. The re-action of the drive unit requires a longer waiting time to refill the air tank with compressed air. Therefore, the working efficiency of the portable air compressor is occasionally reduced.

In view of the foregoing, it is an object of the present invention to provide a portable air compressor having improved work efficiency.

In order to achieve the above and other objects, the present invention provides an air compressor comprising: a compression unit, a drive unit, a slot unit and a control circuit unit. The compression unit is configured to generate a compressed air and is provided with a handle positioned above the center of gravity of the air compressor. The drive unit is configured to drive the compression unit. The slot unit is disposed under the compression unit and A plurality of air slots configured to hold the compressed air are included. The compressed air held in the tank unit has a pressure value. The control circuit unit is configured to detect a pressure value of the compressed air held in the slot unit and control the driving unit to drive the compression unit.

Preferably, the slot unit extends in an elongated direction and includes a first side and a second side disposed downstream of the first side toward the elongated direction. The compression unit includes a first compressor and a second compressor disposed downstream of the first compressor in the elongated direction. The handle has a first end and a second end disposed downstream of the first end in the elongated direction, the first end is coupled to the first compressor, and the second end is coupled to the second compression machine.

Preferably, the air compressor further includes a cover configured to cover at least a portion of the compression unit, the cover being fixed to at least one of the drive unit, the slot unit and the control circuit unit, and Not fixed to the compression unit.

Preferably, the cover is formed with a through hole above the pressure reducing unit. The handle extends through the through hole and is positioned on an outer side of the cover.

Preferably, the cover and the compression unit define a gap therebetween.

Preferably, the air compressor further includes an elastic member disposed between the cover and the compression unit.

Preferably, the driving unit is configured to be driven by an external power source, and at least one of the control circuit unit and the driving unit is provided with a cord, wherein the electric wire has a tip connectable to the external power source section. The cover A protrusion protruding toward the elongated direction and a protruding direction intersecting the vertical direction of the compression unit from the groove unit is provided. The projection includes a flat surface extending toward the elongated direction and toward the vertical direction, and a reel portion configured to guide the electric wire toward the elongated direction and toward the vertical direction to allow the A wire is wound around the reel portion.

Preferably, the slot unit extends in an elongated direction and has a first side and a second side disposed downstream of the first side toward the elongated direction. The protruding portion has an upstream side portion and a downstream side portion disposed downstream of the upstream side portion in the elongated direction. The cover is provided with a holder on at least one of the downstream side portion and the upstream side portion and configured to grip a tip end portion of the wire.

The features and advantages of the present invention, as well as other objects, will become apparent from the following description.

The air compression of one embodiment of the present invention will be described with reference to Figs. 1 through 4, wherein like parts and components are denoted by the same reference numerals to avoid duplication of the description.

The portable air compressor 1 is adapted to supply compressed air to a pneumatic tool such as a pneumatically operated fastener driving tool. The total weight of the air compressor 1 is about 12.9 kg. The air compressor 1 is capable of supplying 110 liters of 0.7 MPa of compressed air per minute, with a maximum pressure of 4.4 MPa. As shown in FIGS. 1 and 2, the air compressor 1 includes a cover 10, a driving unit 20, A compression unit 30, a slot unit 50, a valve unit 60 and a control circuit unit 70.

In the following description, assuming that the air compressor 1 is disposed in one direction and the air compressor 1 is intended to be used in this direction, the terms "upward", "downward", "upper", "lower", "above" will be used. , "below", "below", "right", "left", "before", "after", etc. More specifically, the left side, the right side, the upper side, and the lower side of FIG. 1 are the rear side, the front side, the left side, and the right side of the air compressor 1. Further, the near side and the far side in FIG. 1 are the upper side and the lower side of the air compressor 1.

As shown in FIG. 3, the trough unit 50 includes a pair of air slots 51 and 52, a pair of frames 53, a communication tube 54, and a drain discharge device 57. The pair of air slots 51 and 52 are configured to hold compressed air generated in the compression unit 30. Each of the air grooves 51 and 52 has a hollow cylindrical configuration and its axis is oriented toward the front/rear direction (axial direction). In other words, the grooves 51 and 52 are extended in the front/rear direction (elongated direction). Each of the air slots 51 and 52 has a closed shaft end. The air grooves 51 and 52 are arranged such that their axes are parallel to each other. That is, the air grooves 51 and 52 are juxtaposed to each other in a rightward/leftward direction perpendicular to the axial direction. More specifically, the air groove 51 is disposed to the left of the air groove 52. As shown in FIG. 3, the pair of air grooves 51 and 52 are supported by the pair of frames 53 so as to be fixed to each other. The inside of the air groove 51 communicates with the inside of the air groove 52 via the communication pipe 54.

As shown in FIG. 3, the air groove 51 has a front lower end and a rear lower end, each One end is provided with a vibration-isolating rubber foot 51A. Similarly, the air groove 52 has a front lower end and a rear lower end, and each end is provided with a vibration isolation rubber foot pad 52A. The two rubber feet 51A and the two rubber feet 52A are respectively located at four corners of the air compressor 1. When the air compressor 1 is placed on the ground, the rubber foot pads 51A and the rubber foot pads 52A can be in contact with the ground. Since the rubber foot pads 51A and the rubber foot pads 52A are provided at the four corners of the air compressor 1, the overturning of the air compressor 1 can be prevented.

Furthermore, as shown in FIG. 3, the draining device 57 is disposed above the air tank 51. The draining device 57 is provided with a drain cock 57A and a drain port 57a. The user manually operates the drain cock 57A to selectively open and close the drain cock 57A. The draining device 57 is configured such that when the draining cock 57A is opened, the air passages 51 and 52 can be simultaneously discharged from the draining port 57a via the connecting pipe 54 and a flow passage formed in the draining device 57. Compressed air stored in it.

As shown in FIG. 3, the air groove 51 has a lower left portion, and a cover fixing portion 51B is provided at the lower left portion. The lid fixing portion 51B extends leftward from the air groove 51. Similarly, the air groove 52 has a right upper portion, and a cover fixing portion 52B is provided at the upper right portion. The cover fixing portion 52B extends upward from the air groove 52. Further, the air tank 51 has an upper portion at which a pair of crank-cover fixing portions 51C (Fig. 4) are provided. The driving unit 20 and the compression unit 30 It is fixed to the pair of crank cover fixing portions 51C. The crank cover fixing portions 51C are disposed in the forward/backward direction.

The total weight of the tank unit 50 is about 3.0 kg. The total volume of the pair of air slots 51 and 52 is approximately 8 liters. Furthermore, the trough unit 50 has a center of gravity Gt (Fig. 3). The center of gravity Gt is positioned at the center of the air compressor 1 in the forward/backward direction. The center of gravity Gt is also positioned between the air grooves 51 and 52 in the right/left direction.

As shown in FIG. 3, the driving unit 20 for driving the compression unit 30 is disposed above the air tank 51. Further, as shown in FIG. 2, the drive unit 20 is disposed substantially at the center of the air compressor 1 toward the forward/backward direction. The drive unit 20 is fixed to the air groove 51 and the pair of frames 53. The drive unit 20 is configured by a 3-phase AC brushless motor. The drive unit 20 includes a stator 21, a rotor 22, and an output shaft 23 that is rotatable integrally with the rotor 22. The drive unit 20 is disposed within a crank casing 31 (described later) to position the axis of the output shaft 23 in the right/left direction. The output shaft 23 has a left end to which a rotating shaft 24 is fixed. The rotating shaft 24 is coaxial with the output shaft 23. An axial flow fan 25 is fixed to the rotation shaft 24 and coaxial with the rotation shaft 24. The axial fan 25 is rotatable integrally with the rotating shaft 24. Furthermore, the output shaft 23 has a right end extending through the crankcase 31 (described later).

As shown in FIG. 3, the compression unit 30 is configured to generate compressed air. Above the air tank 51. In other words, the trough unit 50 is disposed below the compression unit 30. Further, as shown in FIG. 2, the compression unit 30 is disposed substantially in the center of the air compressor 1 in the front/rear direction. The compression unit 30 is disposed to the right of the drive unit 20. The compression unit 30 includes the crank casing 31 fixed to the pair of crankcase fixing portions 51C and the upper frame of the pair of frames 53. The crank casing 31 defines a crank chamber (not shown) therein. Within the crankcase, the compression unit 30 further includes a crankshaft (not shown) and a crank arm (not shown). The compression unit 30 further includes a first compressor 32 and a second compressor 33. The first compressor 32 includes a first piston (not shown) and a first cylinder (not shown) for generating compressed air. Similarly, the second compressor 33 includes a second piston (not shown) and a second cylinder (not shown) for generating compressed air.

The crankshaft (not shown) and the crank arm (not shown) are disposed in the crankcase 31. The crankshaft (not shown) is rotatable integrally with the output shaft 23 of the drive unit 20. Further, the crankshaft (not shown) is drivingly coupled to the first piston (not shown) and the second piston (not shown) via the crank arm (not shown). The crankshaft (not shown) is adapted to convert rotational motion of the output shaft 23 of the drive unit 20 to a first piston (not shown) of the first compressor 32 and a second piston of the second compressor 33 (not shown) ) reciprocating motion.

The first compressor 32 extends forward from the crankcase 31. The first compressor 32 includes the first cylinder (not shown), the first piston (not shown) is provided in the first cylinder (not shown) and a first piston (not shown) is coupled to the song A first link (not shown) of the arm (not shown). The first compressor 32 acts as a low pressure side compression unit. The first compressor 32 has a front end portion at which a first cylinder head 32A is provided. A first valve seat (not shown) is provided at a position between the first cylinder head 32A and the first cylinder (not shown). The first valve seat (not shown) is provided with a first inlet (not shown) and a first outlet (not shown).

The second compressor 33 extends rearward from the crank casing 31. The second compressor 33 includes the second cylinder (not shown), the second piston (not shown) is provided in the second cylinder (not shown) and a second piston (not shown) is coupled to the crank arm A second link (not shown) (not shown). The second compressor 33 functions as a high pressure side compression unit. The second compressor 33 has a rear end portion, and a second cylinder head 33A is provided at the rear end portion. A second valve seat (not shown) is provided at a position between the second cylinder head 33A and the second cylinder (not shown). The second valve seat (not shown) is provided with a second inlet (not shown) and a second outlet (not shown).

The first outlet is connected to the second inlet via a tubular member 55, and the second outlet is connected to the air reservoir 52 via a tubular member 56.

As shown in FIGS. 2 and 4, the crank casing 31 has a right side wall, and the right side wall is provided with an air inlet 31a for providing communication between the inside and the outside of the crank casing 31. The intake port 31a is disposed opposite to the axial fan 25 with respect to the drive unit 20 and the crank case 31. That is, the intake port 31a does not face the axial fan 25. Thus, generated by the axial fan 25 The air flow does not directly hit the portion of the crank casing 31 where the intake port 31a is formed.

As shown in Fig. 4, the crank casing 31 has an upper wall formed with a pair of screw holes 31b. One of the pair of screw holes 31b is disposed at a position where the crank casing 31 and the first compressor 32 are connected to each other, and the remaining screw holes of the pair of screw holes 31b are disposed in the crank casing 31 and The second compressors 33 are connected to each other. The two screw holes 31b are arranged in the forward/backward direction.

The compression unit 30 further includes a handle unit 34. The handle unit 34 includes a handle 35, a pair of engaging portions 35A, and a pair of screws 34A, each of the pair of screws 34A being screwably engageable with each of the pair of screw holes 31b. The handle 35 is fixed to the crank casing 31 by screwing of the pair of screws 34A and the pair of screw holes 31b such that the first cover 11 is interposed between the handle 35 and the crank casing 31. At this time, the handle 35 is positioned to extend in the forward/backward direction.

Each of the pair of engaging portions 35A is fixed to the handle 35 by each of the pair of screws 34A. The pair of engaging portions 35A are adapted to hold a shoulder strap (not shown) or the like. The handle 35 is positioned substantially in the center of the air compressor 1 toward the forward/backward direction.

The drive unit 20 and the compression unit 30 have a total weight of approximately 5.7 kg to 5.9 kg. Furthermore, the drive unit 20 and the compression unit 30 have a center of gravity Gp (Fig. 3). The center of gravity Gp is positioned in the air in the forward/backward direction The center of the compressor 1. The center of gravity Gp is also oriented to the left/right direction in the left direction of a broken line L (Fig. 3). This broken line L is a straight line drawn from the handle 35 in the vertical direction.

As shown in FIG. 2, the valve unit 60 includes pressure relief valves 61A and 61B, pressure gauges 62A and 62B, couplers 63A and 63B, pressure adjustment handles 64A and 64B, and socket holders 65A and 65B. More specifically, a group consisting of the pressure relief valve 61A, the pressure gauge 62A, the coupler 63A, the pressure adjustment handle 64A, and the socket holder 65A is disposed above the air tank 52 and to the right of the compression unit 30. Further, a group of the pressure relief valve 61B, the pressure gauge 62B, the coupler 63B, the pressure adjustment handle 64B, and the socket holder 65B is disposed above the air container 52 and to the right of the compression unit 30.

The pressure relief valve 61A is adapted to relieve pressure of compressed air held in the air slots 51 and 52 such that the compressed air has a pressure suitable for exiting from the coupler 63A. This pressure can be adjusted by the pressure adjustment handle 64A. The socket holder 65A is screwed into the pressure relief valve 61A, the coupler 63A, and the pressure gauge 62A. The coupler 63A is adapted to be coupled to the pneumatic tool via a hose for supplying compressed gas to a pneumatically operated fastener drive tool. The pressure of the compressed air exiting the coupler 63A can be monitored via the pressure gauge 62A.

Similarly, the pressure relief valve 61B is adapted to relieve pressure of compressed air stored in the air slots 51 and 52 so that the compressed air has a suitable function to The pressure at which the knot 63B leaves. This pressure can be adjusted by the pressure adjustment handle 64B. The socket holder 65B is screwed into the pressure relief valve 61B, the coupler 63B, and the pressure gauge 62B. The coupler 63B is adapted to be coupled to a pneumatically operated fastener drive tool via a hose for supplying compressed gas to the pneumatic tool. The pressure of the compressed air exiting the coupler 63B can be monitored via the pressure gauge 62B.

Regarding the above configuration of the valve unit 60, regardless of the strength of the pressure of the compressed air introduced into the air grooves 51 and 52, the pressure regulating handle 64A can adjust the pressure of the compressed air on the coupler 63A with a fixed pressure value. So that the fixed pressure value is less than or equal to the maximum pressure value. As a result, compressed air having a pressure value less than or equal to the maximum pressure value can be obtained via the coupler 63A.

Similarly, the pressure regulating handle 64B can adjust the pressure of the compressed air on the coupler 63B with a fixed pressure value so that the fixed pressure value is less than or equal to the maximum pressure value. As a result, compressed air having a pressure value less than or equal to the maximum pressure value can be obtained via the coupler 63B.

The valve unit 60 weighs approximately 1.0 kg. The valve unit 60 has a center of gravity Gv (Fig. 3). The center of gravity Gv is positioned at the center of the air compressor 1 in the forward/backward direction. The center of gravity Gv is also positioned at the center of the valve unit 60 in the right/left direction.

The control circuit unit 70 is configured to detect the pressure value of the compressed air stored in the slot unit 50 and control the driving unit 20 to switch the drive. The moving unit 20 is turned on and off. As shown in FIG. 3, the control circuit unit 70 is disposed below the axial fan 25 and to the left of the air groove 51. The control circuit unit 70 includes a wire 71 having a tip portion connectable to an external power source for driving the drive unit 20. The weight of the control circuit unit 70 is approximately 0.9 kg. The control circuit unit 70 has a center of gravity Gc (Fig. 3). The center of gravity Gc is positioned at the center of the air compressor 1 in the forward/backward direction. The center of gravity Gc is also positioned at the center of the control circuit unit 70 in the right/left direction.

The drive unit 20, the compression unit 30, the tank unit 50, the valve unit 60, and the circuit unit 70 constitute a main unit of the air compressor 1. The main unit has a center of gravity G (Fig. 3).

The driving unit 20 and the center of gravity Gp of the compression unit 30, the center of gravity Gt of the slot unit 50, the center of gravity Gv of the valve unit 60, and the center of gravity Gc of the control circuit unit 70 are respectively positioned in the forward/backward direction at the air compression. The center of the machine 1. Therefore, the center of gravity G of the main unit is positioned at the center of the air compressor 1 in the forward/backward direction.

The driving unit 20 and the center of gravity Gp of the compression unit 30, the center of gravity Gt of the slot unit 50, the center of gravity Gv of the valve unit 60, and the center of gravity Gc of the control circuit unit 70 are respectively positioned at different positions in the rightward/leftward direction. on. However, the center of gravity G of the main unit is positioned in the right/left direction in the vicinity of the broken line L, which is based on the center of gravity Gp, the center of gravity Gt, the center of gravity Gv, and the center of gravity in the rightward and leftward directions. The individual location of Gc and also based on the driver The individual weights of the unit 20, the compression unit 30, the tank unit 50, the valve unit 60, and the control circuit unit 70 are calculated.

Furthermore, the center of gravity G is positioned vertically below the center of gravity Gp of the drive unit 20 and the compression unit 30 and above the slot unit 50.

As shown in FIG. 3, the cover 10 includes a first cover 11, a second cover 12, and an elastic member 13 (Fig. 4). The first cover 11 is made of a resin. The first cover 11 mainly covers the drive unit 20, the compression unit 30, and the valve unit 60. In other words, the cover 10 is configured to cover at least a portion of the compression unit 30. The first cover 11 is fixed to the cover fixing portion 52B. The first cover 11 is also fixed to the upper edge of the second cover 12. The first cover 11 is disposed such that a gap is formed between the driving unit 20 and the compression unit 30 and the first cover 11.

As shown in FIG. 4, the first cover 11 has an upper wall formed with a pair of through holes 11a above the compression unit 30. The pair of through holes 11a allow the handle 35 to extend through and be positioned on the outer side of the first cover 11. The pair of screws 34A can also extend through the pair of through holes 11a via the screw holes 31b. Each of the pair of through holes 11a has a shape so as to be positioned at a portion of the crank casing 31 positioned around each of the screw holes 31b and each of the pair of through holes 11a A gap is formed between the portions of the first cover 11 on the periphery, and a gap is also formed between the handle 35 and a portion of the cover 11 positioned around each of the pair of through holes 11a. That is, the first cover 11 and the compression unit 30 define a gap therebetween.

As shown in FIG. 3, the first cover 11 has a left portion, and a protrusion 11A is provided at the left portion. The projection 11A protrudes to the left so that the axial fan 25 can be accommodated therein. In other words, the protruding portion 11A protrudes in a protruding direction that intersects the forward/backward direction and the perpendicular direction from the compression unit 30 toward the groove unit 50. The projection 11A has a left side planar wall 11B extending in the vertical direction and in the forward/backward direction. The left side wall 11B has a grid-like configuration. That is, the left side wall 11B forms a plurality of through holes for introducing outside air into the cover 10 in conjunction with the rotation of the axial fan 25.

Further, the first cover 11 has a reel portion 11b on the outer periphery of the protruding portion 11A. The reel portion 11b serves as a portion that guides the electric wire 71 in the forward/backward direction and in the vertical direction to allow the electric wire 71 to be wound around the reel portion 11b. More specifically, the reel portion 11b is formed with a groove formed in the upper surface of the protruding portion 11A and extending toward the forward/backward direction, a groove formed in the front surface of the protruding portion 11A and facing the vertical A groove extending in the direction and a combination of grooves formed in the rear surface of the projection 11A and extending in the vertical direction are formed. The protruding portion 11A and the second cover 12 are assembled so that the electric wire 71 can be wound around the reel portion 11b and the second cover 12.

Furthermore, as shown in FIG. 1, the first cover 11 has a pair of holders 11C for holding the pair of wires 71. The pair of holders 11C are disposed around the outside of the protruding portion 11A and adjacent to the left side wall 11B. More specifically, the pair of grips One of the members 11C is disposed on a portion before the protrusion 11A and a remaining holder in the pair of holders 11C is disposed at a portion behind the protrusion 11A.

As shown in FIG. 1, on the upper wall of the first cover 11, an operation panel 11D having a main power switch 11E is provided. The main power switch 11E is adapted to open and close a commercial 3-phase AC power source provided in the air compressor 1. The power supply to the drive unit 20, the control circuit unit 70, and the like is supplied and turned off via the main power switch 11E. Furthermore, the main power switch 11E is also suitable for displaying the pressure value of the compressed air and the warning signal of the image overload stored in the air grooves 51 and 52.

The lid-sub 10 has a weight of about 0.9 kg. The cover 10 is relatively lightweight. The cover 10 is adapted to cover the main unit. Therefore, the air compressor 1 has a center of gravity at a position corresponding to the position of the center of gravity G of the main unit.

The second cover 12 is made of metal. The second cover 12 is fixed to the cover fixing portion 51B and extends upward therefrom. The second cover 12 is adapted to primarily protect the control circuit unit 70. The first cover 11 is supported at an upper edge of the second cover 12.

The elastic member 13 is made of a resin such as rubber and sponge. As shown in FIG. 4, the two elastic members 13 are interposed between the first cover 11 and the handle 35. That is, the elastic members 13 are interposed between the first cover 11 and the compression unit 30. More specifically, one of the elastic members 13 is positioned in the vicinity of a position at which the first compressor 32 is coupled to the crank casing 31 via the front side of the handle 35, and the remaining bombs in the elastic members 13 The structural member is positioned in the vicinity of a position at which the second compressor 33 is connected to the crank casing 31 via the rear end of the handle 35.

Since the elastic members 13 are interposed between the first cover 11 and the handle 35 at a position where the first cover 11 and the handle 35 are adjacent to each other, the direct connection between the first cover 11 and the handle 35 is restricted. contact. In other words, since the elastic members 13 are interposed between the first cover 11 and the compression unit 30 at a position where the first cover 11 and the compression unit 30 are adjacent to each other, the first cover 11 and the first cover 11 are restricted. Direct contact between the compression units 30.

Next, the air compression operation of the air compressor 1 having the above configuration will be described. When the air compressor 1 is in operation, air flows into the cover 10 via a plurality of through holes formed in the first cover 11. Then, the reciprocating motion of the air in combination with the first piston provided in the first cylinder 32 in the first compressor 32 flows into the crank casing 31 via the intake port 31a. Subsequently, the air flows into the first cylinder via a first inlet formed in the first valve seat of the first compressor 32. The air is compressed in the first cylinder to have a pressure value from 0.7 to 0.8 MPa. The compressed air exits from a first outlet formed in the first valve seat of the first compressor 32, and flows through the tubular member 55 through a second inlet formed in the second valve seat of the second compressor 33. A second cylinder provided in the second compressor 33. The compressed air is further compressed in the second cylinder so as to have a pressure value of 3.0 to 4.5 MPa, that is, a maximum allowable pressure value. The compressed air in the second compressor 33 exits from the second outlet formed in the second valve seat of the second compressor 33, The air groove 52 flows into the air through the tubular member 56. The compressed air portion introduced into the air tank 52 flows into the air tank 51 via the communication tube 54. Therefore, the compressed air is stored in the air tank 51 and in the air tank 52 at the same pressure.

When the user carries the air compressor 1 having the above configuration, the user holds the handle 35 to position the air compressor 1 to the right of the user, and the user lifts the air compressor 1. That is, the left side wall 11B of the air compressor 1 is opposed or in contact with the user from the right side of the user. Further, at this time, the electric wire 71 is wound around the reel portion 11b, and the tip end of the electric wire 71 is held by the front holder 11C or the rear holder 11C.

The center of gravity G of the main unit is positioned directly vertically below the handle 35. In other words, the handle 35 is positioned above the center of gravity G. Therefore, even if the user carries the air compressor 1 with the one-handle 35, the air compressor 1 can be stably held. Therefore, the air compressor 1 can be easily carried, and the portability of the air compressor 1 can be improved.

Further, the compression unit 30 has the heaviest weight among the units constituting the main unit of the air compressor 1. Since the handle unit 34 is disposed in the compression unit 30, the center of gravity G of the main unit is positioned adjacent to the handle unit 34. Therefore, when the air compressor 1 is lifted by the handle 35, the instability of the posture of the air compressor 1 can be suppressed.

Further, the cover 10 is not fixed to the compression unit 30, but is fixed to the groove unit 50 in the main unit of the air compressor 1. Furthermore, the cover 10 It is configured such that a gap is formed between the compression unit 30 and the cover 10, and also the handle unit 34 that is assembled to the compression unit 30 forms a gap with the cover 10. The compression unit 30 is provided with the first piston (not shown) for generating vibration and the second piston (not shown). The above configuration can suppress the compression unit 30 from directly transmitting vibration to the cover 10.

Furthermore, the elastic members 13 are disposed at positions where the first cover 11 and the handle 35 are adjacent to each other. The first cover 11 is in contact with the handle 35 and the elastic members 13 are interposed therebetween, and the first cover 11 is in contact with the compression unit 30 and the elastic members 13 are interposed therebetween. The vibration transmitted from the compression unit 30 to the handle 35 can be absorbed by the elastic members 13, and thus, the vibration transmitted from the compression unit 30 to the handle 35 can be prevented from being further transmitted to the first cover 11. The elastic members 13 are disposed on the upper portion of the air compressor 1 and away from the center of gravity G of the main unit. Therefore, the elastic members 13 have a higher vibration absorbing effect, which reduces the vibration. Therefore, noise reduction and long service life can also be achieved.

When the user carries the air compressor 1, the left side wall 11B of the cover 10 is positioned to oppose or contact the body of the user. The left side wall 11B is formed in a planar shape. Therefore, the left side wall 11B can be in close contact with the body of the user. Thus, when the user holds the handle 34 with his/her right hand to carry the air compressor 1, the left side wall 11B is brought into contact with the user's body. As a result, the user can hold the air compressor 1 in a steady state.

In addition, the handle unit 34 has the joints 35A for the shoulder straps It is attached to the handle unit 34. When the user places the shoulder strap attached to the handle unit 34 on his/her shoulder to carry the air compressor 1, the user can stably stabilize the left side wall 11B by bringing the left side wall 11B into close contact with the user's body. The air compressor 1 is carried without holding the handle 35.

Further, when the user carries the air compressor 1, the reel portion 11b is disposed at a position that is not in contact with the user's body. The electric wire 71 is wound around the reel portion 11b, and the tip end portion of the electric wire 71 is held in the holder 11C. Therefore, when the user carries the air compressor 1, the reel portion 11b blocks the electric wire 71 from obstructing the user. Further, the holder 11C prevents the electric wire 71 from being loosened from the reel portion 11b.

Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be apparent to those skilled in the art

For example, the drive unit 20 is configured by the three-phase AC brushless motor in the above specific example. However, the drive unit 20 can be configured by other types of motors.

In the above specific example, the tank unit 50 includes the two air grooves 51 and 52. However, the number of air slots provided in the slot unit 50 is not limited thereto. The trough unit 50 can include more than two air slots.

In the above specific example, the first cover 11 is fixed to the groove unit 50. However, in addition to the compression unit 30, the first cover 11 may be fixed to at least one of the drive unit 20, the slot unit 50, and the control circuit unit 70. By.

In the above specific example, the control circuit unit 70 includes the electric code 71. However, the drive unit 20 may be provided with an electric wire wound around the reel portion 11b.

1‧‧‧Portable air compressor

10‧‧‧ cover

11‧‧‧First cover

11a‧‧‧through hole

11A‧‧‧Protruding

11b‧‧‧Reel Department

11B‧‧‧Left wall

11C‧‧‧Clamps

11D‧‧‧ operation panel

11E‧‧‧Main power switch

12‧‧‧second cover

13‧‧‧Flexible components

20‧‧‧Drive unit

21‧‧‧ Stator

22‧‧‧Rotor

23‧‧‧ Output shaft

24‧‧‧Rotary axis

25‧‧‧Axial fan

30‧‧‧Compression unit

31‧‧‧ crankcase casing

31a‧‧‧air inlet

31b‧‧‧ screw holes

32‧‧‧First compressor

32A‧‧‧First cylinder head

33‧‧‧Second compressor

33A‧‧‧Second cylinder head

34‧‧‧Hand unit

34A‧‧‧screw

35‧‧‧Handle

35A‧‧‧ joint

50‧‧‧ slot unit

51‧‧‧Air trough

51A‧‧‧Vibration isolation rubber feet

51B‧‧‧Cover fixing

51C‧‧‧Crankshaft cover fixing

52‧‧‧Air trough

52A‧‧‧Vibration isolation rubber feet

52B‧‧‧Cover fixing

53‧‧‧Frame

54‧‧‧Connected pipe

55‧‧‧Tubular components

56‧‧‧Tubular components

57‧‧‧Draining device

57a‧‧‧Excretion

57A‧‧‧Draining cock

60‧‧‧ valve unit

61A‧‧‧pressure relief valve

61B‧‧‧Relief valve

62A‧‧‧ pressure gauge

62B‧‧‧ pressure gauge

63A‧‧‧Connector

63B‧‧‧Connector

64A‧‧‧pressure adjustment handle

64B‧‧‧pressure adjustment handle

65A‧‧‧ socket seat

65B‧‧‧ socket seat

70‧‧‧Control circuit unit

71‧‧‧Wire

L‧‧‧ dotted line

G‧‧‧ center of gravity

Gc‧‧‧ center of gravity

Gp‧‧‧ center of gravity

Gt‧‧‧ center of gravity

Gv‧‧‧ center of gravity

Figure 1 is a plan view of an air compressor according to a specific example of the present invention having a cover; Figure 2 is a plan view of the air compressor according to the specific example, the cover is omitted from the air compressor; Figure 3 is along A cross-sectional view of the air compressor according to the specific example of the line III-III shown in Fig. 1; and Fig. 4 is a cross-sectional view of the air compressor according to the specific example taken along line IV-IV shown in Fig. 2.

10‧‧‧ cover

11b‧‧‧Reel Department

11‧‧‧First cover

11D‧‧‧ operation panel

11B‧‧‧Left wall

20‧‧‧Drive unit

12‧‧‧second cover

30‧‧‧Compression unit

25‧‧‧Axial fan

32‧‧‧First compressor

31‧‧‧ crankcase casing

35‧‧‧Handle

34‧‧‧Hand unit

51A‧‧‧Vibration isolation rubber feet

51‧‧‧Air trough

52‧‧‧Air trough

51B‧‧‧Cover fixing

52B‧‧‧Cover fixing

52A‧‧‧Vibration isolation rubber feet

54‧‧‧Connected pipe

53‧‧‧Frame

57a‧‧‧Excretion

57‧‧‧Draining device

60‧‧‧ valve unit

57A‧‧‧Draining cock

71‧‧‧Wire

70‧‧‧Control circuit unit

Claims (8)

An air compressor (1) comprising: a compression unit (30) configured to generate a compressed air and a handle (35) positioned above a center of gravity (G) of the air compressor; a drive unit (20) configured to drive the compression unit (30); a slot unit (50) disposed below the compression unit (30) and including a plurality of air slots configured to hold the compressed air ( 51, 52), the compressed air stored in the tank unit (50) has a pressure value; and a control circuit unit (70) configured to detect the storage in the tank unit (50) The pressure value of the compressed air and the drive unit (20) are controlled to drive the compression unit (30). The air compressor of claim 1, wherein the slot unit (50) extends in an elongated direction and includes a first side and a second side disposed downstream of the first side toward the elongated direction; The compression unit (30) includes a first compressor (32) and a second compressor (33) disposed downstream of the first compressor in the elongated direction; and wherein the handle (35) has a first end and A second end downstream of the first end is disposed in the elongated direction, the first end is coupled to the first compressor (32), and the second end is coupled to the second compressor (33). An air compressor according to claim 1, further comprising a cover (10) configured to cover at least a portion of the compression unit, the cover (10) being fixed to the drive unit (20), the slot unit (50) and the control circuit At least one of the units (70) is not fixed to the compression unit (30). An air compressor according to claim 3, wherein the cover (10) is formed with a through hole (11a) above the compression unit (30); and wherein the handle (35) extends through the through hole (11a) ) and positioned on the outside of the cover (10). The air compressor of claim 3, wherein the cover (10) and the compression unit (30) define a gap therebetween. An air compressor according to claim 3, further comprising an elastic member (13) disposed between the cover (10) and the compression unit (30). The air compressor of claim 3, wherein the driving unit (20) is configured to be driven by an external power source, and at least one of the control circuit unit (70) and the driving unit (20) has a wire (71), wherein the wire (71) has a tip end connectable to the external power source; wherein the cover (10) is disposed in a direction perpendicular to the elongated direction and a direction from the compression unit to the slot unit a protruding portion (11A) protruding in a protruding direction, the protruding portion (11A) including a plane (11B) extending in the elongated direction and in the vertical direction; and a reel portion (11b) configured to be used The electric wire (71) is guided in the elongated direction and in the vertical direction to allow the electric wire (71) to be wound around the reel portion (11b). The air compressor of claim 7, wherein the slot unit (50) extends toward an elongated direction and has a first side and a second side disposed downstream of the first side toward the elongated direction; Wherein the protrusion (11A) has an upstream side portion and a downstream side portion disposed downstream of the upstream side portion in the elongated direction; wherein the cover (10) is provided in the downstream side portion and the upstream side portion At least one of them is configured as a holder (11C) for clamping a tip end portion of the electric wire (71).